The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 12, 2010
Filed:
Oct. 12, 2007
Masahiro Kanai, Suwa, JP;
Eitaro Otsuka, Fujimi-machi, JP;
Naoki Yoshida, Suwa, JP;
Akihiro Fukuzawa, Suwa, JP;
Masahiro Kanai, Suwa, JP;
Eitaro Otsuka, Fujimi-machi, JP;
Naoki Yoshida, Suwa, JP;
Akihiro Fukuzawa, Suwa, JP;
Seiko) Epson Corporation, Tokyo, JP;
Abstract
An oscillation driver circuit includes a gain control amplifier which causes a vibrator to produce driving vibrations by controlling an oscillation amplitude in an oscillation loop, and a comparator which generates a synchronous detection reference signal based on a signal in the oscillation loop. The comparator has an output current limiting function. The oscillation driver circuit causes the vibrator to produce vibrations using an output from the comparator in a state in which the gain in an oscillation loop formed by the vibrator and the comparator is set to be larger than unity, and then causes the vibrator to produce the driving vibrations by controlling an oscillation amplitude in an oscillation loop formed by the vibrator and the gain control amplifier.